/*!	 target_cairo.h
**	 Template Header for the Target Cairo class
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2012-2013 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifndef __SYNFIG_TARGET_CAIRO_H
#define __SYNFIG_TARGET_CAIRO_H

#include "target.h"
#include "cairo.h"

namespace synfig
{

class CairoSurface;

/*!	\class Target_Cairo
**	 This is a Target class that implements the render fucntion
* for a CairoSurface
*/
class Target_Cairo : public Target
{
    // Number of threads to use
    // int threads_;

public:
    typedef etl::handle<Target_Cairo> Handle;
    typedef etl::loose_handle<Target_Cairo> LooseHandle;
    typedef etl::handle<const Target_Cairo> ConstHandle;
    // Default constructor (current frame = 0)
    Target_Cairo();

    // Renders the canvas to the target
    virtual bool render(ProgressCallback *cb = NULL);

    // Obtain a surface pointer based on the render method
    // this function has to be overrrided by the derived targets
    // to create the proper Cairo backend surface for each target type.
    virtual bool obtain_surface(cairo_surface_t*&) = 0;

    // Returns the number of peniding frames to render. If it is zero it
    // stops rendering frames.
    virtual int next_frame(Time& time);

    // Puts the rendered surface onto the target.
    virtual bool put_surface(cairo_surface_t *surface, ProgressCallback *cb = NULL);
    // Filters the cairo surface based on gamma (hardcored for the moment to 2.2)
    static void gamma_filter(cairo_surface_t* surface, const synfig::Gamma gamma);

private:
}; // END of class Target_Cairo

}; // END of namespace synfig

#endif